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Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables) | 12 Months Ended
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May. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of intangible assets, at cost | The components of intangible assets, at cost, consisted of the following:
|  | May 31,
In millions |  | 2015 |  | 2014
Client lists |  | $ | 244.6 |  |  | $ | 240.9 |
Other intangible assets |  | 3.2 |  |  | 2.6 |
Total intangible assets, gross |  | 247.8 |  |  | 243.5 |
Less: Accumulated amortization |  | 215.4 |  |  | 202.9 |
Intangible assets, net of accumulated amortization |  | $ | 32.4 |  |  | $ | 40.6 |
Estimated future amortization expense relating to intangible assets | The estimated amortization expense for the next five fiscal years relating to intangible asset balances is as follows:
In millions Year ending May 31, |  | Estimated amortization expense
2016 |  | $ | 11.3 |
2017 |  | 8.2 |
2018 |  | 5.5 |
2019 |  | 3.6 |
2020 |  | 2.0 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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